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ST 3300/2

10 Program Controller with Delay, 4 Ramps and 4 Dwells.

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ST 3300/3

10 Program Controller with Delay, 16 Ramps and 16 Dwellsfor more complex applications.

Designed for use in firing fusing and slumping glass.

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ST 3300/4

Similar to the 3300/3, but with the added refinement of an event function, allowing manual or programmed control of a damper or similar external device.

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ST 3300/5

In addition to offering an event function, the 3300/5 Controller is used on larger Ovens and Kilns where the load is split into individual Zones for improved temperature uniformity.

Additionally, an over temperature Policeman Controller is fitted as standard to offer additional protection for your Kiln /Oven.

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STAFFORD CONTROLLERS

ST 316A CONTROLLER.

THIS CONTROLLER COMES IN VARIOUS SPECIFICATIONS

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ST 501 CONTROLLER

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ST 222 CONTROLLER

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General Information

Stafford Instruments manufacture a range of different Temperature Controllers.

Broadly speaking our controllers can operate in ONE OR BOTH of two modes explained below:

Signal Mode: (ST31XA and ST501A) In Signal Mode the controller provides a signal(s) to remote relay(s) or contactor(s) which is (are) normally located inside the kiln casing. The Heavy Duty Relay or contactor switches the High Power to the Kiln Elements and not the relays mounted internally in the controller itself. Controllers operating a kiln in this modeare usually connected to the kiln via a controller cable. This cable is normally a composite cable consisting of 10 cores. 2 of these cores are temperature compensated cores specifically for the thermocouple wiring. This specialised cable is not readily available. Stafford Instruments have it speciallymanufactured by one of the leading cable manufacturers in the United Kingdom. Most modern kilns have a socket mounted on the kiln. This socket mates to an opposite gender plug which is fitted to the end of the controllers umbilical cable. The Standard type of Plug and socket used by the majority of Kiln Manufacturers is a Harting 7D 8PinSquare Type. A Minority of Kiln Manufacturers use a CPC14 Pin Round Plug and socket. Images of the different types are shown below:

Harting Type 7D 8 Pin Plugfitted on end of Controller Cable

Associated Harting Kiln Socket fitted on kiln

CPC14 14 pin Round Plug fitted on end of controller cable

Power Mode: (ST221 / ST222 and ST31XA) In Power Mode the relays inside the controller switch the actual power to the kiln elements directly. In this mode a heavy duty cable is used between the controller and the kiln, and the above type of connectors and cable are NOT used. The ST221 and ST222 are Power controllers and can switch a Max Load of 3KW or 13A directly. The ST31X Range of controllers when configured in Power Mode ( selectable by an internal link) can switch a maximum of 5KW or 20A. Below is a table that shows the mode type that our differing controller types can operate in.